Abstract
Salt cavern with a volume of hundreds of thousands of cubic meters for storing electrolyte has been considered as a promising large-scale storage technology. However, the solubility and electrochemical stability of active organic species are significantly limited in saturated brine solution. Here, an unsymmetrical two-electron viologens with high solubility in aqueous system is synthesized via a simple two-step reaction route. As a novel two-electron storage anolyte, its electrochemical properties are investigated in detail by cyclic voltammetry and rotating disk electrode voltammetry. Paired with (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) derivatives, the battery delivers an exceptionally high cell voltage of 1.63 V, an energy efficiency of ~80%, and an average 99.95% capacity retention per cycle at 30 mA/cm2. To extend in saturated brine solution, the battery also exhibits a high cell efficiency and stable cycle performance, providing a promising strategy for developing the large scale salt-cavern redox flow batteries.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
